Self-cleaning screen.



F. O. STROMBORG.

SELF CLEANING SCREEN. APPLICATION TILED JULY 3, 1913.

Patented June 23, 1914.

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UNITED STATES PATENT onrion.

FRITZ OSCAR STROMBORG, OF SEATTLE, WASHINGTON.

SELF-CLEANING SCREEN.

To all whom it may concern:

Be it known that I, FRITZ Osoan STRoM- Bonc', citizen of the United States, residing at Seattle, in the county of King and State of lVashington, have invented certain new and useful Improvements in Self-Cleaning Screens; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to separators, and the object of the same is to produce a screening device for the separation of materials of different sizes such as gravel and sand, or

crushed rock or ores in a process of concen tration or sizing into the different grades needed for effective treatment on the machines employed in the separation process.

One object of my invention is to provide a screening device of this character wherein there is a continuous movement of the materials to be sized or graded.

Another object is to secure the largest possible area of screening surface so as to produce the most efiective work. By this I mean to say that in a rotary screen only part of the screening surface is working while the major portion is idle, but with a flat screen the entire area can be made to perform effective service.

A still further object of the present invention is to provide means whereby the screening surface may be given a perfect shaking out Or cleaning from time to time so that the kernels or grains of material which have become lodged therein will be removed with hardly an interruption to the screening action.

These and other objects will be more fully described in the following specification and claims, and are shown in the accompanying drawings wherein- Figure 1 is a plan view of this device. Fig. 2 is a cross section on the line 22 of Fig. 1; Fig. 3 a cross section on the line 83 thereof; and Fig. a a longitudinal section.

Wheels 1 run on a track 2 supporting a base 30, the entire base being agitated or reciprocated by means of a pitman rod 4 connecting it with a crank 5, but this illustration is merely typical of any means for movably mounting the base and reciprocating it to and fro in one direction. Said base has three relatively high bearings 32 Specification of Letters Patent.

Application filed July 3, 1913.

Patented June 23, 1914:.

Serial No. 777,369.

and three relatively low bearings 83, and in each pair of bearings rest the ournals of independent and preferably square frames,

their lower journals carrying gears 34 intermeshing with each other, and one of them being continued so as to carry a pinion 22, which meshes with a rack bar 23 slidably mounted in the base 30 and having a handle 2a at its front end. The three separate screens illustrated are duplicates of each other, and I need describe but one. It has a skeleton framework 35 with a closed lower end 36 and an upper end 37 carrying a tubular ournal 15. The screen surface 38 is carried around all four sides of the framework 3 and terminates short of its lower end, so that there are produced four outlet open ings 20, The diverging spouts 31 divide the material from the hopper 8 into three separate streams which flow into separate screens.

lVhile it is of course possible to have the screen surfaces on opposite sides of the frames, it is better to have the screen surfaces on four sides thereof. Hence the screen surface 38 is carried clear around the rectangular frame structure 35. This detail results in the necessity for turning the screen but one-quarter revolution in order to bring a new working face or panel thereof into action, although if the kernels or pieces are very firmly lodged therein it is possible to give the handle 24: a little more ample movement so as to turn each screen for fully one-half a revolution, and then the surface in which the pieces are stuck will come uppermost so that said pieces will be automatically dislodged by the reciprocation of the entire base.

I do not wish to be confined too strictly to the details of construction, and especially as with the structure shown, the screens might be of different mesh so that the sizing of the material into different grades could be carried on simultaneously. Nor do I wish to be limited to the use which is to be made of this machine, as it is obviously capable of sifting or screening grain and the like, as well as ore as at first suggested.

What is claimed as new is:

In a screen of the class described, the combination with a track, a base having wheels traveling on said track, means for reciprocating the base over said track, a plurality of bearings rising from one end of the base, a plurality of bearings rising from lower end, intermeshing gears on the journals at the lower ends thereof, a pinion fast on one of said journals, and a slidable rack bar engaging said pinion, for the purpose set forth.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

FRITZ OS GAR STROMBORG.

Witnesses:

CARL Gr. BnNsoN, AXEL Hnnnnno.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

' Washington, D. C. 

